------------[ cut here ]------------
kmem_cache of name '9p-fcall-cache-(null)' already exists
WARNING: CPU: 0 PID: 7528 at mm/slab_common.c:108 kmem_cache_sanity_check mm/slab_common.c:107 [inline]
WARNING: CPU: 0 PID: 7528 at mm/slab_common.c:108 __kmem_cache_create_args+0xb4/0x334 mm/slab_common.c:294
Modules linked in:
CPU: 0 UID: 0 PID: 7528 Comm: syz.1.189 Not tainted 6.12.0-rc4-syzkaller-g526116b79e8c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : kmem_cache_sanity_check mm/slab_common.c:107 [inline]
pc : __kmem_cache_create_args+0xb4/0x334 mm/slab_common.c:294
lr : kmem_cache_sanity_check mm/slab_common.c:107 [inline]
lr : __kmem_cache_create_args+0xb4/0x334 mm/slab_common.c:294
sp : ffff80009d6274c0
x29: ffff80009d6274c0 x28: dfff800000000000 x27: 1fffe00019ba0409
x26: 0000000000000000 x25: 0000000000008001 x24: ffff80008fab2e88
x23: ffff0000c59fd6a8 x22: 0000000000008001 x21: ffff80009d6275a0
x20: 0000000000000000 x19: ffff0000cbedfcc0 x18: 1fffe000366c7476
x17: ffff80008f7fd000 x16: ffff80008035a72c x15: 0000000000000001
x14: 1fffe000366c9f20 x13: ffff80009d628000 x12: 0000000000000003
x11: 0000000000000001 x10: 0000000000000003 x9 : 82b964da8f982900
x8 : 82b964da8f982900 x7 : ffff8000802c8c64 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000006 x1 : ffff80008b614f00 x0 : ffff800123eeb000
Call trace:
 kmem_cache_sanity_check mm/slab_common.c:107 [inline] (P)
 __kmem_cache_create_args+0xb4/0x334 mm/slab_common.c:294 (P)
 kmem_cache_sanity_check mm/slab_common.c:107 [inline] (L)
 __kmem_cache_create_args+0xb4/0x334 mm/slab_common.c:294 (L)
 kmem_cache_create_usercopy include/linux/slab.h:361 [inline]
 p9_client_create+0xac0/0xed0 net/9p/client.c:1049
 v9fs_session_init+0x190/0x16ec fs/9p/v9fs.c:410
 v9fs_mount+0xd4/0x92c fs/9p/vfs_super.c:122
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662
 vfs_get_tree+0x90/0x28c fs/super.c:1800
 do_new_mount+0x278/0x900 fs/namespace.c:3507
 path_mount+0x590/0xe04 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount fs/namespace.c:4032 [inline]
 __arm64_sys_mount+0x45c/0x5a8 fs/namespace.c:4032
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
irq event stamp: 1376
hardirqs last  enabled at (1375): [<ffff8000802c8d04>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1517 [inline]
hardirqs last  enabled at (1375): [<ffff8000802c8d04>] finish_lock_switch+0xbc/0x1e4 kernel/sched/core.c:5082
hardirqs last disabled at (1376): [<ffff80008b497d20>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:488
softirqs last  enabled at (1320): [<ffff8000802089c4>] softirq_handle_end kernel/softirq.c:400 [inline]
softirqs last  enabled at (1320): [<ffff8000802089c4>] handle_softirqs+0xa38/0xbf8 kernel/softirq.c:582
softirqs last disabled at (1101): [<ffff800080020db4>] __do_softirq+0x14/0x20 kernel/softirq.c:588
---[ end trace 0000000000000000 ]---